hiv cutoff value fear please help me in this?.

[cloud6]

Dear Doctor

I have done unsafe sex in Dec 2015 and I have tested hiv Elisa after 18 days result got negative but ratio is 0.017 and cutoff value is 0.207 . Second test I have done after 3 months in February 2016 and result got negative but ratio has been increased to 0.065 and cutoff is 0.265 . Again I have  tested in June 2016 result got negative but ratio again increased, now 0.094 and cutoff value is 0.279 .
My question is why ratio is increasing ?
Is there any chance to infect?  Please tell me am in safe zone are not?  
Above result I got after 6 months.. Is this necessary to retest again after 3/6 months to confirm?
Please help me out of this

Thank you

[Chima7]

The index value does not matter. They shouldn't even include it on the test results because people like you start asking these types of questions about it. The ONLY thing you need to be concerned about is that your result is NON Reactive.

Those index values will always change and you'll never get the same number twice. It's no different than getting your blood glucose or your cholesterol tested. You would get a different number every time you took those tests and the number will go up and down but it doesn't matter at all as long as you're under the cutoff for the maximum number. Which you ARE, so you have zero concerns.

Your February test was conclusively negative and your June test was completely unnecessary. Stop testing because you're 100% conclusively NEGATIVE.

[cloud6]

Thank you so much for the valuable answer